Sennheiser CX 680 Earfin Sports Earbuds (Certified Refurbished) This Certified Refurbished product is manufacturer refurbished, shows limited or no wear, and includes all original accessories plus a 90 day warranty Ear sleeves have been replaced and are brand new High-output drivers for energizing sound Eafin holding system provides a secure fit during workouts. Sweat and water resistant DuPont Kevlar-reinforced cable for unmatched sound